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HowtoForge: Secure Your Apache With mod_security

"This article shows how to install and configure mod_security.
mod_security is an Apache module (for Apache 1 and 2) that provides
intrusion detection and prevention for web applications. It aims at
shielding web applications from known and unknown attacks, such as
SQL injection attacks, cross-site scripting, path traversal
attacks, etc.

"In the first chapter I will show how to install mod_security on
Debian Sarge, Ubuntu 6.06 LTS (Dapper Drake), and on Fedora Core 5,
and in the second chapter I will describe how to configure Apache
for mod_security which is independent from the distribution you're
using..."